using Microsoft.AspNetCore.Authorization;
using Microsoft.AspNetCore.SignalR;
using Microsoft.AspNetCore.Mvc;
using Microsoft.EntityFrameworkCore;
using Microsoft.Extensions.Options;
using QMax.Api.Configuration;
using QMax.Api.Contracts;
using QMax.Api.Data;
using QMax.Api.Data.Entities;
using QMax.Api.Infrastructure.Hubs;
using QMax.Api.Infrastructure.Max;
using QMax.Api.Services;

namespace QMax.Api.Controllers;

[ApiController]
[Authorize]
[Route("api/max")]
public sealed class MaxController(
    IMaxBridgeClient maxBridge,
    MaxBridgeSyncService syncService,
    QMaxDbContext db,
    IHubContext<QMaxHub> hubContext,
    ChatProjectionService projection,
    IOptions<QMaxOptions> options) : ControllerBase
{
    private readonly QMaxOptions _options = options.Value;

    [HttpGet("status")]
    public async Task<ActionResult<MaxBridgeStatusDto>> Status(CancellationToken cancellationToken)
    {
        var status = await maxBridge.GetStatusAsync(cancellationToken);
        await SaveStateAsync(status, cancellationToken);
        return ToDto(status);
    }

    [HttpPost("login/start")]
    public async Task<ActionResult<MaxBridgeStatusDto>> BeginLogin(BeginMaxLoginRequest request, CancellationToken cancellationToken)
    {
        var phone = string.IsNullOrWhiteSpace(request.PhoneNumber) ? _options.MaxPhoneNumber : request.PhoneNumber;
        if (string.IsNullOrWhiteSpace(phone))
        {
            return BadRequest("Phone number is required.");
        }

        var status = await maxBridge.BeginPhoneLoginAsync(phone, cancellationToken);
        await SaveStateAsync(status, cancellationToken);
        return ToDto(status);
    }

    [HttpPost("login/code")]
    public async Task<ActionResult<MaxBridgeStatusDto>> SubmitCode(SubmitMaxCodeRequest request, CancellationToken cancellationToken)
    {
        var status = await maxBridge.SubmitLoginCodeAsync(request.Code, cancellationToken);
        await SaveStateAsync(status, cancellationToken);
        return ToDto(status);
    }

    [HttpGet("browser/snapshot")]
    public async Task<ActionResult<MaxBrowserSnapshotDto>> Snapshot(CancellationToken cancellationToken)
    {
        var snapshot = await maxBridge.GetSnapshotAsync(cancellationToken);
        return new MaxBrowserSnapshotDto(snapshot.Url, snapshot.Title, snapshot.BodyText, snapshot.ScreenshotPngBase64, snapshot.CapturedAt);
    }

    [HttpPost("sync")]
    public async Task<ActionResult<object>> Sync(CancellationToken cancellationToken)
    {
        var changed = await syncService.SyncOnceAsync(cancellationToken);
        return new { changed };
    }

    [HttpGet("channels/search")]
    public async Task<ActionResult<IReadOnlyList<MaxChannelSearchResultDto>>> SearchChannels(
        string q,
        CancellationToken cancellationToken)
    {
        if (string.IsNullOrWhiteSpace(q))
        {
            return Array.Empty<MaxChannelSearchResultDto>();
        }

        var results = await maxBridge.SearchChannelsAsync(q.Trim(), cancellationToken);
        return results.Select(ToDto).ToArray();
    }

    [HttpPost("channels/subscribe")]
    public async Task<ActionResult<ChatDto>> SubscribeChannel(
        SubscribeMaxChannelRequest request,
        CancellationToken cancellationToken)
    {
        if (string.IsNullOrWhiteSpace(request.Link))
        {
            return BadRequest("Channel link is required.");
        }

        var update = await maxBridge.JoinChannelAsync(request.Link.Trim(), cancellationToken);
        if (update is null)
        {
            return BadRequest("MAX did not return a channel for this link.");
        }

        await syncService.ApplyJoinedChannelAsync(update, cancellationToken);
        var chat = await db.Chats.FirstOrDefaultAsync(
            x => x.DeletedAt == null &&
                (x.ExternalId == update.ExternalId ||
                 (!string.IsNullOrWhiteSpace(update.ChatUrl) && x.WebUrl == update.ChatUrl)),
            cancellationToken);
        if (chat is null)
        {
            return BadRequest("Channel was joined but was not saved in QMAX.");
        }

        await hubContext.Clients.All.SendAsync("ChatListInvalidated", cancellationToken);
        return projection.ToDto(chat);
    }

    private async Task SaveStateAsync(MaxBridgeStatus status, CancellationToken cancellationToken)
    {
        var state = await db.MaxAccountStates.FirstOrDefaultAsync(x => x.Id == 1, cancellationToken);
        if (state is null)
        {
            state = new MaxAccountState { Id = 1 };
            db.MaxAccountStates.Add(state);
        }

        state.PhoneNumber = _options.MaxPhoneNumber;
        state.Status = status.Status;
        state.IsAuthorized = status.IsAuthorized;
        state.LastUrl = status.Url;
        state.LastError = status.LastError;
        state.UpdatedAt = DateTimeOffset.UtcNow;
        await db.SaveChangesAsync(cancellationToken);
        await hubContext.Clients.All.SendAsync("MaxStatusChanged", ToDto(status), cancellationToken);
    }

    private static MaxBridgeStatusDto ToDto(MaxBridgeStatus status)
    {
        return new MaxBridgeStatusDto(status.Mode, status.IsAuthorized, status.LoginStage, status.Status, status.Url, status.Title, status.LastError, status.UpdatedAt);
    }

    private static MaxChannelSearchResultDto ToDto(MaxChannelSearchResult channel)
    {
        return new MaxChannelSearchResultDto(channel.ExternalId, channel.Title, channel.AvatarUrl, channel.ChatUrl, channel.IsSubscribed, channel.Description);
    }
}